School lets us row (6)
I believe the answer is:
tussle
'row' is the definition.
'school lets us' is the wordplay.
'school' indicates an anagram (school can mean to improve or manipulate).
'lets'+'us'='letsus'
'letsus' anagrammed gives 'TUSSLE'.
(Other definitions for tussle that I've seen before include "Go at it" , "Fight vigorously" , "Struggle like wrestling bout" , "Grapple" , "Struggle or wrestling match" .)