Morse, involved in link, gets boring (8)
I believe the answer is:
tiresome
'boring' is the definition.
('tiresome' can be a synonym of 'boring')
'morse involved in link' is the wordplay.
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'in' means one lot of letters goes inside another.
'link' becomes 'tie' ('tie' can be a synonym of 'link').
'morse' anagrammed gives 'resom'.
'resom' put inside 'tie' is 'TIRESOME'.
'gets' is the link.
(Other definitions for tiresome that I've seen before include "irritating" , "Boring, annoying" , "So metier may be boring (8)" , "Causing boredom" , "Fatiguing, tedious" .)