Infantry heading for trap track back (6)
I believe the answer is:
troops
'infantry heading' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'trap track back' is the wordplay.
'trap' becomes 't' (this might be a standard abbreviation which I don't know about).
'track' becomes 'spoor' (track left by an animal).
'back' is a reversal indicator.
'spoor' written backwards gives 'roops'.
't'+'roops'='TROOPS'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for troops that I've seen before include "Military forces" , "Military divisions" , "Soldiers, armed forces" , "men" , "Groups of soldiers" .)