After Hamilton's third chicane negotiated, one may be waiting in the pits (8)
I believe the answer is:
mechanic
'one may be waiting in the pits' is the definition.
I can't tell whether this definition defines the answer.
'after hamilton's third chicane negotiated' is the wordplay.
'after hamilton's third' becomes 'm' (I can't explain this - if you can you should give a lot more credence to this answer).
'negotiated' indicates an anagram.
'chicane' anagrammed gives 'echanic'.
'm'+'echanic'='MECHANIC'
Can you help me to learn more?
(Other definitions for mechanic that I've seen before include "Person who repairs cars etc." , "Mender of machines" , "One repairs engines" , "Skilled repairer" , "Trained garage assistant" .)