The clot is prone to cover for the girls (7)
I believe the answer is:
lassies
'girls' is the definition.
(lassie is a kind of girl)
'the clot is prone to cover' is the wordplay.
'the clot' becomes 'ass' (I've seen this before).
'is prone' becomes 'lies' (I've seen this before).
'to cover' is an insertion indicator.
'ass' going into 'lies' is 'LASSIES'.
'for the' is the link.
(Other definitions for lassies that I've seen before include "Wee Scottish girls" , "Young women" .)