Initially awkward kid in relaxed position (2,4)
I believe the answer is:
at ease
'in relaxed position' is the definition.
'initially awkward kid' is the wordplay.
'initially' indicates taking the first letters.
'kid' becomes 'tease' (I've seen this in another clue).
The initial letter of 'awkward' is 'a'.
'a'+'tease'='AT EASE'
(Other definitions for at ease that I've seen before include "Calm" , "'Relaxed (2,4)'" , "Free from anxiety,in comfort" , "Military order to relax from attention" , "Relaxed, not tense - that's an order" .)