Crossword Genius

Substitutes go far, son, and very cheaply (3,1,4)

Ross

I believe the answer is:

for a song

'very cheaply' is the definition.
(I've seen this in another clue)

'substitutes go far son' is the wordplay.
'substitutes' indicates anagramming the letters (I've seen 'substitute' mean this).
'go'+'far'+'son'='gofarson'
'gofarson' with letters rearranged gives 'FOR A SONG'.

'and' acts as a link.

(Another definition for for a song that I've seen is " Very reasonably".)

I've seen this clue in the Sydney Morning Herald.
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