Crossword Genius

Crude oil on tap? It's not necessary (8)

Ross

I believe the answer is:

optional

'not necessary' is the definition.
(I've seen this in another clue)

'crude oil on tap?' is the wordplay.
'crude' indicates anagramming the letters.
'oil'+'on'+'tap'='oilontap'
'oilontap' anagrammed gives 'OPTIONAL'.

'it's' is the link.

(Other definitions for optional that I've seen before include "Available as a choice but not obligatory" , "Platoon I may leave to choice" , "'Left to choice, not compulsory (8)'" , "By choice, elective" , "Elective, as you choose" .)

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