It's old perhaps and not easily moved (6)
I believe the answer is:
stolid
'not easily moved' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs sometimes mean the same thing.
'it's old perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'its'+'old'='itsold'
'itsold' anagrammed gives 'STOLID'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for stolid that I've seen before include "Hard to move" , "cool" , "with a stiff upper lip" , "Unemotional, unresponsive" , "Impassive or apathetic" .)