A soldier and a pretty girl you see at the salad bar (6)
I believe the answer is:
radish
'you see at the salad bar' is the definition.
I can't tell whether this definition defines the answer.
'a soldier and a pretty girl' is the wordplay.
'a soldier' becomes 'RA' (member of the Royal Artillery).
'and' is a charade indicator (letters next to each other).
'a pretty girl' becomes 'dish' (I've seen this in other clues).
'ra'+'dish'='RADISH'
Can you help me to learn more?
(Other definitions for radish that I've seen before include "Sir had this vegetable" , "Pungent fleshy edible root eaten in salads" , "Small red salad vegetable" , "Hottish salad plant" , "3 down" .)