The ultramarine part is “electric” (4)

I believe the answer is:

tram

'is electric' is the definition.
(thesaurus)

'the ultramarine part' is the wordplay.
'part' says the answer is hidden in the clue.
'TRAM' is hidden in the letters of 'ultramarine'.

(Other definitions for tram that I've seen before include "Public transport vehicle" , "An early form of Luas in Dublin transport" , "Take it to the mart" , "The Luas, say" , "Old city transport, ram on rails through streets" .)

I've seen this clue in the Evening Standard.

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