Drew old rock band t-shirts for hippies (3-4)

I believe the answer is:

tie-dyes

't-shirts for hippies' is the definition.
(tie-dye shirts)

'drew old rock band' is the wordplay.
'drew' becomes 'tied' ('tie' can be a synonym of 'draw').
'old rock band' becomes 'Yes' (Yes is a prog rock band).
'tied'+'yes'='TIE-DYES'

I've seen this clue in The Times.

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