Straitlaced English duke ready for firing (6)
I believe the answer is:
primed
'ready for firing' is the definition.
'primed' can be an answer for 'ready' (I've seen this before). I'm unsure of the 'for firing' bit.
'straitlaced english duke' is the wordplay.
'straitlaced' becomes 'prim' (synonyms).
'english' becomes 'E' (abbreviation).
'duke' becomes 'd' (abbreviation).
'prim'+'e'+'d'='PRIMED'
Can you help me to learn more?
(Other definitions for primed that I've seen before include "Filled in" , "Made ready (to fire)" , "Made ready for action" , "charged" , "Briefed - ready" .)