Crossword Genius

Free oil on tap is not compulsory (8)

Ross

I believe the answer is:

optional

'not compulsory' is the definition.
(I've seen this before)

'free oil on tap' is the wordplay.
'free' indicates an anagram.
'oil'+'on'+'tap'='oilontap'
'oilontap' anagrammed gives 'OPTIONAL'.

'is' acts as a link.

(Other definitions for optional that I've seen before include "'Left to choice, not compulsory (8)'" , "Platoon I may leave to choice" , "Platoon I join as a matter of choice" , "'Elective, not obligatory (8)'" , "Voluntary - not required" .)

I've seen this clue in The Independent.
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