Some in creche long for order (7)
I believe the answer is:
echelon
'order' is the definition.
(thesaurus)
'some in creche long for' is the wordplay.
'some in' indicates a hidden word.
'ECHELON' is hidden in the letters of 'creche long for'.
(Other definitions for echelon that I've seen before include "Level of command" , "Degree" , "Bishops, say" , "Offset-lines formation" , "position in society" .)