Like two peas in a pod to be loosely laced in it (9)
I believe the answer is:
identical
'like two peas in a pod' is the definition.
(I've seen this before)
'loosely laced in it' is the wordplay.
'loosely' is an anagram indicator (a looser version of the letters).
'laced'+'in'+'it'='lacedinit'
'lacedinit' with letters rearranged gives 'IDENTICAL'.
'to be' is the link.
(Other definitions for identical that I've seen before include "Matching" , "uniform" , "Aid client to be the very same" , "lacking distinction" , "Equal" .)