Crossword Genius

Old electrical device, valuable (2,3)

Ross

I believe the answer is:

of use

'valuable' is the definition.

'old electrical device' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'electrical device' becomes 'fuse' (fuse is a kind of electrical device).
'o'+'fuse'='OF USE'

(Other definitions for of use that I've seen before include "Serviceable" , "practical" , "Nifty" , "Useful" , "Having a function" .)

I've seen this clue in The Times.
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