First in team to request job (4)
I believe the answer is:
task
'job' is the definition.
(synonyms)
'first in team to request' is the wordplay.
'first in team' becomes 't' (1st letter of 'team').
'to request' becomes 'ask' (to ask is to request something).
't'+'ask'='TASK'
(Other definitions for task that I've seen before include "Job, undertaking" , "Set piece of work" , "Errand, duty" , "Arduous bit of work" , "Allocate work" .)