Found bearings to be rotten idea, strangely (10)
I believe the answer is:
orientated
'found bearings' is the definition.
'rotten idea strangely' is the wordplay.
'strangely' indicates anagramming the letters.
'rotten'+'idea'='rottenidea'
'rottenidea' with letters rearranged gives 'ORIENTATED'.
'to be' acts as a link.
(Other definitions for orientated that I've seen before include "adjusted appropriately" , "Determined" .)