Spare ink spilt around new sail (9)
I believe the answer is:
spinnaker
'sail' is the definition.
(spinnaker is a kind of sail)
'spare ink spilt around new' is the wordplay.
'spilt' indicates anagramming the letters.
'around' is an insertion indicator.
'new' becomes 'n'.
'spare'+'ink'='spareink'
'spareink' with letters rearranged gives 'spinaker'.
'spinaker' placed around 'n' is 'SPINNAKER'.
(Other definitions for spinnaker that I've seen before include "Large triangular sail at the front of a yacht" , "Large racing sail" , "Lightweight sail" , "one using the breeze" , "Large three-cornered sail" .)