Dream of trade supporting India (5)
I believe the answer is:
ideal
'dream' is the definition.
(I've seen this in another clue)
'trade supporting india' is the wordplay.
'trade' becomes 'deal' (synonyms).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'deal' after 'i' is 'IDEAL'.
'of' is the link.
(Other definitions for ideal that I've seen before include "Pattern" , "Embodying perfection" , "In her dreams" , "Quite perfect, can't be improved on" , "principle to be aimed at" .)