Skirt worn by favourite (6)

I believe the answer is:

minion

'favourite' is the definition.

'skirt worn' is the wordplay.
'skirt' becomes 'mini' (a mini skirt).
'worn' becomes 'on'.
'mini'+'on'='MINION'

'by' is the link.

(Other definitions for minion that I've seen before include "Servile dependant" , "An archaic servant or inferior (6)" , "Servile follower" , "Flunky" , "Servile favourite" .)

I've seen this clue in The Guardian.

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