Project worker under notice becoming military aide (8)
I believe the answer is:
adjutant
'military aide' is the definition.
(I've seen this before)
'project worker under notice' is the wordplay.
'project' becomes 'jut' (I've seen this before).
'worker' becomes 'ant' (worker is a type of ant).
'under' says to put letters next to each other.
'notice' becomes 'ad'.
'jut'+'ant'='jutant'
'jutant' after 'ad' is 'ADJUTANT'.
'becoming' acts as a link.
(Other definitions for adjutant that I've seen before include "Military aide" , "Aide-de-camp" , "Officer who helps" , "Army staff officer" , "one with large bill" .)