Join compiler coming in commando? (7)
I believe the answer is:
soldier
'commando?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'join compiler coming in' is the wordplay.
'join' becomes 'solder' (soldering is a kind of joining).
'compiler coming' becomes 'i' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'solder' enclosing 'i' is 'SOLDIER'.
Can you help me to learn more?
(Other definitions for soldier that I've seen before include "trained killer" , "Member of the military" , "20 down man" , "Server in army" , "Member of the armed forces" .)