Quality of slow service with sailor needing to eat on ship (9)
I believe the answer is:
tardiness
'quality of slow service' is the definition.
(tardiness means slowness)
'sailor needing to eat on ship' is the wordplay.
'sailor' becomes 'tar' (slang term for a sailor).
'needing' means one lot of letters go next to another.
'to eat' becomes 'dine' (to dine is to eat a meal).
'on' means one lot of letters go next to another.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'tar'+'dine'+'ss'='TARDINESS'
'with' is the link.
(Other definitions for tardiness that I've seen before include "Unpunctuality" , "Habit of being late" , "Delay" , "Becoming late" , "No quality in fast food" .)