Quiet at the back, Roger! (5)
I believe the answer is:
shaft
'roger' is the definition.
Both the definition and answer are verbs in their base form.
Perhaps you can see an association between them that I don't see?
'quiet at the back' is the wordplay.
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'at' is a charade indicator (letters next to each other).
'the back' becomes 'aft' (at the back of a ship).
'sh'+'aft'='SHAFT'
Can you help me to learn more?
(Other definitions for shaft that I've seen before include "Ray; access hole to a mine" , "A little light" , "Stem, handle; (light) ray" , "Ray (of sunlight)" , "Body of an arrow" .)