I ate carp, unfortunately with bad consequences (2,1,5)
I believe the answer is:
at a price
'bad consequences' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'i ate carp unfortunately' is the wordplay.
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'i'+'ate'+'carp'='iatecarp'
'iatecarp' with letters rearranged gives 'AT A PRICE'.
'with' is the link.
Can you help me to learn more?
(Other definitions for at a price that I've seen before include "Involving unwelcome consequences" , "costing quite a bit" , "Not cheaply" .)