English weakness after credit for crack (7)
I believe the answer is:
crevice
'crack' is the definition.
('crevice' can be a synonym of 'crack')
'english weakness after credit' is the wordplay.
'english' becomes 'e' (abbreviation).
'weakness' becomes 'vice' (I've seen this before).
'after' means one lot of letters go next to another.
'credit' becomes 'cr'.
'e'+'vice'='evice'
'evice' put after 'cr' is 'CREVICE'.
'for' is the link.
(Other definitions for crevice that I've seen before include "Cleft, fissure" , "Narrow rock fissure" , "Crack or fissure." , "Opening" , "Narrow crack" .)