Warnings from heads of the surgery about dodgy heart (7)
I believe the answer is:
threats
'warnings' is the definition.
(threat is a kind of warning)
'heads of the surgery about dodgy heart' is the wordplay.
'heads of' suggests taking the first letters.
'about' means one lot of letters goes inside another.
'dodgy' indicates anagramming the letters.
The initial letters of 'the surgery' is 'ts'.
'heart' anagrammed gives 'hreat'.
'ts' placed around 'hreat' is 'THREATS'.
'from' is the link.
(Other definitions for threats that I've seen before include "Expressions of intention to harm" , "Sources of danger -- shatter (anag)" , "Menacing statements" , "Statements of intentions to harm" , "Shatter (anag) - menaces" .)