Bloodsucker seeing quarry on strike (7)
I believe the answer is:
lamprey
'bloodsucker' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'quarry on strike' is the wordplay.
'quarry' becomes 'prey' (synonyms).
'on' is a charade indicator (letters next to each other).
'strike' becomes 'lam' (to 'lam' means to hit hard).
'prey' after 'lam' is 'LAMPREY'.
'seeing' acts as a link.
Can you help me to learn more?
(Other definitions for lamprey that I've seen before include "Freshwater eel-like fish" , "Eel-like animal" , "sucker for stones" , "Swimmer" , "Marine carnivore" .)