New one, lamb, out for count? (8)
I believe the answer is:
nobleman
'count?' is the definition.
(count is a kind of nobleman)
'new one lamb out' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'one'+'lamb'='onelamb'
'onelamb' is an anagram of 'obleman'.
'n'+'obleman'='NOBLEMAN'
'for' is the link.
(Other definitions for nobleman that I've seen before include "count, perhaps" , "High-ranking male" , "Male aristocrat" , "Member of peerage" , "member of Upper House" .)