A hybrid sort of clue (6)

I believe the answer is:

across

'sort of clue' is the definition.
(in a crossword)

'a hybrid' is the wordplay.
'hybrid' becomes 'cross' (I've seen this before).
'a'+'cross'='ACROSS'

(Other definitions for across that I've seen before include "stride - athwart" , "From side to side of (something)" , "Transversely" , "ax" , "First word in any crossword" .)

I've seen this clue in The Times.

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