18a. Small part of litter, in turn, recycled. (4) (r==t). 20a. Quit or accept new contract? (6) (r==i=n). 19d. Denial, for example, that's accepted by people. (8) (==g==i=n). TIA
14a. Substance which participates in the clotting of blood. (14) (==r=m=o=l=s=i=). 1d. Transparent stone used in olden times for windows (8) (p=e=g===) TIA
7a. Primarily Muslim place within its continent. (8) (=a===s==) 11a. Anti-government articles are, we hear, fashionable. (8)(==a===i=) 25a. Animal show's presenter cuts exactly in two. (6) (t=m=a=)...