Deft clue is an anagram I included; tricky! (9)
I believe the answer is:
deceitful
'tricky' is the definition.
(thesaurus)
'deft clue is an anagram' is the wordplay.
'is an' becomes 'i' (Roman numeral for one).
'anagram' indicates an anagram.
'deft'+'clue'+'i'='deftcluei'
'deftcluei' anagrammed gives 'DECEITFUL'.
'i included' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for deceitful that I've seen before include "Deliberately misleading" , "Duplicitous" , "Dishonest" , "cheating" , "Sly" .)