One criticised about old remote (8)
I believe the answer is:
isolated
'remote' is the definition.
(I've seen this before)
'one criticised about old' is the wordplay.
'one' becomes 'i' (Roman numeral).
'criticised' becomes 'slated' (I've seen this before).
'about' is an insertion indicator.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'slated' placed around 'o' is 'solated'.
'i'+'solated'='ISOLATED'
(Other definitions for isolated that I've seen before include "Set apart, quarantined" , "(Left) on one's own" , "Idols ate (anag.)" , "Cut off, remote" , "Solitary" .)