Soldiers coming in chatted about their special unit? (10)
I believe the answer is:
detachment
'special unit?' is the definition.
'detachment' can be an answer for 'unit?' (detachment is a kind of unit). I'm unsure of the 'special' bit.
'soldiers coming in chatted about' is the wordplay.
'soldiers' becomes 'men' (men can mean a group of soldiers).
'coming in' means one lot of letters goes inside another.
'about' is an anagram indicator.
'chatted' anagrammed gives 'detacht'.
'men' inserted within 'detacht' is 'DETACHMENT'.
'their' acts as a link.
Can you help me to learn more?
(Other definitions for detachment that I've seen before include "inclination to keep to the objective" , "indifference" , "Aloofness" , "Military unit" , "squad" .)