People beginning to do repair (4)
I believe the answer is:
mend
'repair' is the definition.
(synonyms)
'people beginning to do' is the wordplay.
'people' becomes 'men' (men are people).
'beginning to' says to take the initial letters.
The first letter of 'do' is 'd'.
'men'+'d'='MEND'
(Other definitions for mend that I've seen before include "'Restore, fix (4)'" , "Heal" , "Put right" , "Fix, repair" , "Make improvements" .)