Servant is LA clubs guide (6)
I believe the answer is:
lackey
'servant' is the definition.
(a lackey is a servant or assistant)
'la clubs guide' is the wordplay.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'guide' becomes 'key' (eg the key is the guide to a map).
'la'+'c'+'key'='LACKEY'
'is' acts as a link.
(Other definitions for lackey that I've seen before include "An archaic menial or follower" , "Old footman or servile follower" , "An archaic servant or underling" , "Flunkey, sycophant" , "Sycophant, toady" .)