Trail suspect over bridge (6)
I believe the answer is:
rialto
'bridge' is the definition.
(I've seen this before)
'trail suspect over' is the wordplay.
'suspect' indicates anagramming the letters (a suspicious or unusual spelling).
'over' becomes 'o' (cricket abbreviation).
'trail' is an anagram of 'rialt'.
'rialt'+'o'='RIALTO'
(Other definitions for rialto that I've seen before include "Area famous for 7 [ABRIDGE]" , "exchange" , "Venetian district" , "Dublin district, or Shakespeare's 'What news on the . . . . . .?'" , "Famous Venetian bridge" .)