I'm still tuck on three. The first and last are thematic.
7a Sloppy cowpat in hood (6) -A-T-O
13a Cause to inflate? (4,4,2) -I-E, -I-E, -O
20A Red Planet discernible in detail, all basically looking to the skies? (4) -N-T
7a answer is (Al) Capone (hood) , increase to CAPTWO which is an anagram of Cowpat
13a Give rise to
20a LNET
The definition is Red (Lenin) nine reversed becomes ten reversed
= LNET the last letters of Planet discernible in detail = LNET
(looking to the skies means last letters as it is a downwards clue)