Value new site with friend (8)
I believe the answer is:
estimate
'value' is the definition.
(I've seen this before)
'new site with friend' is the wordplay.
'new' indicates an anagram.
'with' is a charade indicator (letters next to each other).
'friend' becomes 'mate' (mate is a kind of friend).
'site' anagrammed gives 'esti'.
'esti'+'mate'='ESTIMATE'
(Other definitions for estimate that I've seen before include "Gauge - approximation" , "Reckon, judge" , "Guess, rough calculation" , "Form opinion of - tea times (anag)" , "Make approximate judgement of size or amount" .)