Repulsive women try to cuddle up, hugging Romeo (7)
I believe the answer is:
Here is my best explanation:
'repulsive women' is the definition.
'try to cuddle up hugging romeo' is the subsidiary indication.
'try' becomes 'go' (go is a kind of try).
'to cuddle' becomes 'snog'.
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'hugging' means one lot of letters goes inside another.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'snog' in reverse letter order is 'gons'.
'gogons' placed around 'r' is 'gorgons'.
(Other definitions for gorgons that I've seen before include "fierce women", "Mythical Greek sisters whose look turned people to stone", "Monstrous sisters", "Ugly sisters" and "Three winged sister monsters with 'hair' of writhing snakes".)