Bear under repaired end of bridge (6)
I believe the answer is:
endure
'bear' is the definition.
(synonyms)
'under repaired end of bridge' is the wordplay.
'repaired' indicates an anagram.
'end of' says to take the final letters.
The final letter of 'bridge' is 'e'.
'under' anagrammed gives 'endur'.
'endur'+'e'='ENDURE'
(Other definitions for endure that I've seen before include "Bear, stick it out" , "'Last, bear (6)'" , "Bear, suffer" , "Last (anag.)" , "Last or undergo" .)