Cross part of lengthy bridge (6)

I believe the answer is:

hybrid

'cross' is the definition.
(I know that cross can be written as hybrid)

'part of lengthy bridge' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'HYBRID' is hidden within 'lengthy bridge'.

(Other definitions for hybrid that I've seen before include "outcome of miscegenation?" , "Genetic cross" , "Produced by crossbreeding" , "Like a mule" , "Cross of two different species or varieties" .)

I've seen this clue in The Telegraph.

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