Free half of beer for a biker (5)
I believe the answer is:
rider
'a biker' is the definition.
I can't tell whether this defines the answer.
'free half of beer' is the wordplay.
'free' becomes 'rid' (to be free of something is to be rid of it).
'half of' means to take half the letters.
'beer' with half the letters taken is 'er'.
'rid'+'er'='RIDER'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for rider that I've seen before include "Supplementary verdict brought in by jury" , "recommendation for mercy?" , "Condition added to a legal document" , "Catch" , "One in the saddle" .)