Tuna scarce? Perhaps - and lobster, for example (10)
I believe the answer is:
crustacean
'lobster for example' is the definition.
(lobster is a kind of crustacean)
'tuna scarce? perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'tuna'+'scarce'='tunascarce'
'tunascarce' with letters rearranged gives 'CRUSTACEAN'.
'and' is the link.
(Other definitions for crustacean that I've seen before include "Animal like a crab" , "crab maybe" , "crab, for example?" , "Perhaps crab" , "Hard-shelled arthropod" .)