Sweetheart given break to find mangetout (5,4)
I believe the answer is:
Here is my best explanation:
'mangetout' is the definition.
(I've seen this before)
'sweetheart given break' is the subsidiary indication.
'sweetheart' becomes 'sugar'.
'given break' becomes 'snap' (snapping is a kind of breaking. I am not sure about the 'given' bit.**).
'to find' is the link.
(Other definitions for sugar snap that I've seen before include "Vegetable's", "item of food" and "Mangetout".)