Cheers getting an alternative 1 (5)
I believe the answer is:
toast
'cheers' is the definition.
(I've seen this before)
'an alternative 1' is the wordplay.
I cannot really understand how this works, but
'an' could be 'a' and 'a' is found in the answer.
The remaining letters 'tost' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for toast that I've seen before include "Raising of glasses" , "Formally drink a health" , "Grilled bread - drink (to)" , "Raise a glass to (someone)" , "It's found under marmalade and butter" .)