Massive pair of soldiers (5)
I believe the answer is:
giant
'massive' is the definition.
(synonyms)
'pair of soldiers' is the wordplay.
I cannot really see how this works, but
'of soldiers' could be 'gi' (e.g. 'a GI helmet') and 'gi' is found within the answer.
The remaining letters 'ant' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for giant that I've seen before include "Large mythical figure" , "Jumbo" , "Large black and white mammal" , "Gargantuan" , "Monster" .)