Father's bearings are out of date (5)
I believe the answer is:
passe
'out of date' is the definition.
(I've seen this in another clue)
'father's bearings' is the wordplay.
'father's' becomes 'pa's' (pa can mean dad or father).
'bearings' becomes 'se' (I can't explain this - if you can you should give a lot more credence to this answer).
'pas'+'se'='PASSE'
'are' acts as a link.
Can you help me to learn more?
(Other definitions for passe that I've seen before include "Out of date" , "Outdated" , "No longer in fashion" , "Out-of-date (French)" , "Old hat" .)