Top taken off alcohol, desperate for it (5)
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I believe the answer is:
randy
'for it' is the definition.
I can't judge whether this defines the answer.
'top taken off alcohol desperate' is the wordplay.
'taken off' is a deletion indicator.
'alcohol' becomes 'port' (port is a type of wine).
'desperate' becomes 'andy' (I can't explain this - if you can you should give a lot more credence to this answer).
'port' with 'top' removed is 'r'.
'r'+'andy'='RANDY'
Can you help me to learn more?
(Other definitions for randy that I've seen before include "boisterous locally" , "Eager to get into bed" , "Lustful" , "Hot" .)
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