Lab gear moved for part of maths (7)
I believe the answer is:
algebra
'part of maths' is the definition.
(I know that algebra part of mathematics)
'lab gear moved' is the wordplay.
'moved' is an anagram indicator.
'lab'+'gear'='labgear'
'labgear' anagrammed gives 'ALGEBRA'.
'for' is the link.
(Other definitions for algebra that I've seen before include "Symbol-based branch of mathematics" , "'Branch of mathematics, uses letters and symbols (7)'" , "for study in class" , "subject with many unknowns" , "Branch of maths - real bag (anag)" .)