Reliable about time, not easily distracted (6)
I believe the answer is:
stolid
'easily distracted' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs occasionally define each other.
'reliable about time' is the wordplay.
'reliable' becomes 'solid' (I've seen this in another clue).
'about' means one lot of letters goes inside another.
'time' becomes 't' (abbreviation).
'solid' enclosing 't' is 'STOLID'.
'not' is the link.
Can you help me to learn more?
(Other definitions for stolid that I've seen before include "Wooden" , "Not easily aroused" , "displaying little emotion" , "Heavy" , "Bovine" .)