Sweetheart given break to find mangetout (5,4)
I believe the answer is:
sugar snap
'mangetout' is the definition.
(I've seen this before)
'sweetheart given break' is the wordplay.
'sweetheart' becomes 'sugar'.
'given' means one lot of letters go next to another.
'break' becomes 'snap' (snapping is a kind of breaking).
'sugar'+'snap'='SUGAR SNAP'
'to find' is the link.
(Other definitions for sugar snap that I've seen before include "Vegetable's" , "item of food" , "Mangetout" .)