Old boy with beaker returned for soup (5)
I believe the answer is:
gumbo
'soup' is the definition.
(gumbo is a kind of soup)
'old boy with beaker returned' is the wordplay.
'old boy' becomes 'ob'.
'with' is a charade indicator (letters next to each other).
'beaker' becomes 'mug' (I've seen this before).
'returned' is a reversal indicator.
'ob'+'mug'='obmug'
'obmug' backwards is 'GUMBO'.
'for' is the link.
(Other definitions for gumbo that I've seen before include "Okra pods" , "Spicy soup; okra" , "Spicy Cajun soup" , "Soup from Louisiana" , "Okra; spicy Cajun dish" .)