Playing Lancaster is out of line (9)
I believe the answer is:
ancestral
'of line' is the definition.
(I've seen this before)
'playing lancaster' is the wordplay.
'playing' indicates an anagram.
'lancaster' is an anagram of 'ANCESTRAL'.
'is out' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for ancestral that I've seen before include "Coming down the line" , "Patrimonial" , "Relating to one's forebears" , "To do with forebears, say stately home" , "Hereditary" .)