Crossword Genius

Boost contained in carton I collected (5)

Ross

I believe the answer is:

tonic

'boost' is the definition.
(thesaurus)

'contained in carton i collected' is the wordplay.
'contained in' says the answer is hidden in the clue.
'TONIC' can be found hidden inside 'carton i collected'.

(Other definitions for tonic that I've seen before include "that may be mixed with gin" , "__water; gin mixer" , "requirement for invigoration?" , "something nice and fresh" , "Key" .)

I've seen this clue in The Telegraph.
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