Gather rice, eggs and peas, primarily (4)
I believe the answer is:
reap
'gather' is the definition.
(reaping is a kind of gathering)
'rice eggs and peas primarily' is the wordplay.
'primarily' suggests taking the first letters.
The initial letters of 'rice eggs and peas' is 'REAP'.
(Other definitions for reap that I've seen before include "''As you sow, so you . . . .'' (4)" , "Gather 23dn" , "Cut or gather (a harvest)" , "Save harvest, glean" , "Harvest, garner" .)