Son hauls up bundles of crops (7)
I believe the answer is:
sheaves
'bundles of crops' is the definition.
'sheaves' can be an answer for 'bundles' ('sheaf' can be a synonym of 'bundle'). I am unsure of the 'of crops' bit.
'son hauls up' is the wordplay.
I cannot quite see how this works, but
'son' could be 's' (genealogical abbreviation for son) and 's' is found in the answer.
The remaining letters 'heaves' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sheaves that I've seen before include "loads of paper" , "Bundles of grain stalks" , "He saves (anag.)" , "Bundles of corn tied together" .)