Vacuum-maker finds first-rate Bottom cradling head of Puck (3-4)

'vacuum-maker' is the definition.

'first-rate bottom cradling head of puck' is the wordplay.
'first-rate' becomes 'ai' (resembles Ar, informal term for excellent).
'bottom' becomes 'rump' (synonyms).
'cradling' is an insertion indicator.
'head of' suggests taking the first letters.
The first letter of 'puck' is 'p'.
'rump' enclosing 'p' is 'rpump'.
'ai'+'rpump'='AIR-PUMP'

'finds' acts as a link.