Figure an unruly truant is out to be uncommunicative (8)
I believe the answer is:
taciturn
'be uncommunicative' is the definition.
(associated in meaning)
'figure an unruly truant is out' is the wordplay.
'figure an' becomes 'ci' (I can't explain this - if you can you should believe this answer much more).
'unruly' indicates anagramming the letters.
'is out' means one lot of letters goes inside another.
'truant' anagrammed gives 'taturn'.
'ci' placed into 'taturn' is 'TACITURN'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for taciturn that I've seen before include "Disinclined towards conversation" , "Habitually silent" , "Far from talkative" , "Without saying much" , "Uncommunicative, of few words" .)