Huge American soldier meeting worker (5)
I believe the answer is:
giant
'huge' is the definition.
(I've seen this before)
'american soldier meeting worker' is the wordplay.
'american soldier' becomes 'gi' (**).
'meeting' says to put letters next to each other.
'worker' becomes 'ant' (worker is a type of ant).
'gi'+'ant'='GIANT'
(Other definitions for giant that I've seen before include "Designating big" , "Monster" , "Jumbo" , "Superhuman being" , "Large black and white mammal" .)