Seabird leaving home has little hesitation to get fish (6)
I believe the answer is:
puffer
'fish' is the definition.
(puffer is a kind of fish)
'seabird leaving home has little hesitation' is the wordplay.
'seabird' becomes 'puffin' (puffin is a kind of seabird).
'leaving' is a deletion indicator.
'home' becomes 'in' ('he's home' can mean 'he's in').
'has' means one lot of letters go next to another.
'little hesitation' becomes 'er'.
'puffin' with 'in' taken away is 'puff'.
'puff'+'er'='PUFFER'
'to get' acts as a link.
(Other definitions for puffer that I've seen before include "Globefish - steam train?" , "Fish that can inflate itself with air" , "[SOMETHING FISHY]" , "Smoker - globefish" , "Globe fish" .)