Crossword Genius

Polish friend back filled with a tattoo (3-1-3)

Ross

I believe the answer is:

rub-a-dub

'tattoo' is the definition.
(thesaurus)

'polish friend back filled with a' is the wordplay.
'polish' becomes 'rub' (polish meaning rub to make shiny).
'friend' becomes 'bud' (shortly for buddy).
'back' shows that the letters should be reversed in order.
'filled with' is an insertion indicator.
'bud' in reverse letter order is 'dub'.
'rub'+'dub'='rubdub'
'rubdub' enclosing 'a' is 'RUB-A-DUB'.

I've seen this clue in The Times.
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