Rows of small picks (6)
I believe the answer is:
sculls
'rows' is the definition.
(sculling is a kind of rowing)
'small picks' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'picks' becomes 'culls' ('cull' can be a synonym of 'pick').
's'+'culls'='SCULLS'
'of' acts as a link.
(Other definitions for sculls that I've seen before include "Oars; race" , "Small oars used by single rowers" , "Pair of short oars used by single oarsman" , "Small oars used by single rower" , "Pair of small oars" .)