He's smart enough to get a drink, with a bit of luck (5)

'he's smart enough to' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'a drink with a bit of luck' is the wordplay.
'a drink' becomes 'ale' (type of beer).
'with' says to put letters next to each other.
'a bit of luck' becomes 'ck' (I can't explain this - if you can you should give a lot more credence to this answer).
'ale'+'ck'='ALECK'

'get' is the link.

Can you help me to learn more?