Runs in frantically shaping choice of words (8)
I believe the answer is:
phrasing
'choice of words' is the definition.
('phrasing' can be a synonym of 'choice of words')
'runs in frantically shaping' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'in' is an insertion indicator.
'frantically' indicates anagramming the letters (I've seen this in other clues).
'shaping' is an anagram of 'phasing'.
'r' inserted into 'phasing' is 'PHRASING'.
(Other definitions for phrasing that I've seen before include "Choice of words" , "Expressing in groups of words" , "Sharp gin (anag.)" .)