Nonsense from pig was heard initially (7)
I believe the answer is:
hogwash
'nonsense' is the definition.
(I've seen this before)
'pig was heard initially' is the wordplay.
'pig' becomes 'hog' (synonyms).
'initially' indicates taking the first letters.
The initial letter of 'heard' is 'h'.
'hog'+'was'+'h'='HOGWASH'
'from' is the link.
(Other definitions for hogwash that I've seen before include "bull" , "Colloquial nonsense to pig cleanser" , "Bunkum" , "Pig food" , "garbage" .)