Informed of central heating for the aged (4)
I believe the answer is:
told
'informed' is the definition.
(telling is a kind of informing)
'central heating for the aged' is the wordplay.
'central' indicates the central letters.
'for' is a charade indicator (letters next to each other).
'the aged' becomes 'old' (I've seen this before).
The centre of 'heating' is 't'.
't'+'old'='TOLD'
'of' is the link.
(Other definitions for told that I've seen before include "Related (a story)" , "Assured" , "Made an impact" , "instructed" , "Authorised - broadcast" .)