you mag

[jules1525]

18D implement rules
12A defame, slander
23A hindrance

[gen2]

12a calumniate (how many letters?)

[gen2]

23a obstruction, impediment, handicap, encumbrance, obstacle, stumbling-block, block, barrier, bar, check, curb, restraint, restriction, thwarting, interference, interruption, stoppage, hold-up, delay, limitation, difficulty, drag, snag, hitch, drawback, disadvantage, inconvenience, deterrent, foil

How many letters?

[jonty23]

Hi, 18d) enforce. 12a)malign 23a)obstacle. regards, John.

[gen2]

It is always a good idea when asking for answers to include both the number of letters and any letters that you already have.

[jules1525]

thanks... you've obviously completed it!!
julie

[gen2]

No, I haven't even seen it. Why else do you think I'd be asking for the number of letters?

As a newbie, you are probably not familiar with the protocol on this site. When asking questions, it is usual (and polite) to state the question, the number of letters and what letters you already have in the answer. That way you optimise your chances of a correct answer and avoid frustrating others who wish to help. Even if you don't need their help this time, you may depend on them in the future.