Guard nuclear bunker? (6)
I believe the answer is:
warden
'guard nuclear bunker?' is the definition.
'warden' can be an answer for 'guard' (thesaurus). I'm not certain of the 'nuclear bunker?' bit.
'guard nuclear bunker?' is the wordplay.
'guard' becomes 'ward' ('ward' can be a synonym of 'guard').
'nuclear bunker?' becomes 'en' (I am not sure about this - if you are sure you should believe this answer much more).
'ward'+'en'='WARDEN'
Can you help me to learn more?
(Other definitions for warden that I've seen before include "Custodian" , "Chief official in charge of a prison" , "Official with supervisory duties, as in relation to a church" , "Andrew, strangely, is in prison" , "Guardian" .)