Dream of one US soldier cutting hair (7)
I believe the answer is:
imagine
'dream of' is the definition.
(I've seen this before)
'one us soldier cutting hair' is the wordplay.
'one' becomes 'i' (Roman numeral).
'us soldier' becomes 'gi' (I've seen this in other clues).
'cutting' indicates putting letters inside (some letters cut their way into a word).
'hair' becomes 'mane' (I have seen 'Long hair ' mean 'mane' so perhaps 'hair' could also mean 'mane').
'gi' inserted into 'mane' is 'magine'.
'i'+'magine'='IMAGINE'
(Other definitions for imagine that I've seen before include "Picture mentally" , "Picture in one's mind" , "John Lennon classic (just think of it!)" , "Believe to be so, suppose" , "Picture to oneself" .)