Development gets into a pickle (9)
I believe the answer is:
gestation
'development' is the definition.
(I've seen this before)
'gets into a pickle' is the wordplay.
'pickle' indicates an anagram (I've seen 'pickled' mean this (I've seen this in other clues)).
'gets'+'into'+'a'='getsintoa'
'getsintoa' anagrammed gives 'GESTATION'.
(Other definitions for gestation that I've seen before include "Development over time" , "Development (in womb)" , "Development of plan" , "as before being transported by coach" , "Period of development" .)