The Spanish king will get large deer (3)
I believe the answer is:
elk
'large deer' is the definition.
(I've seen this before)
'the spanish king' is the wordplay.
'the spanish' becomes 'el'.
'king' becomes 'k'.
'el'+'k'='ELK'
'will get' acts as a link.
(Other definitions for elk that I've seen before include "Type of moose" , "Large northern deer" , "Wapiti" , "Asian moose" , "Largest living deer" .)