Postpone both changes in shopping centre (8)
I believe the answer is:
mothball
'postpone' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how they can define each other.
'both changes in shopping centre' is the wordplay.
'changes' indicates anagramming the letters.
'in' is an insertion indicator.
'shopping centre' becomes 'mall' (a mall is a large shopping complex).
'both' is an anagram of 'othb'.
'othb' placed within 'mall' is 'MOTHBALL'.
Can you help me to learn more?
(Other definitions for mothball that I've seen before include "Lay aside for a long time" , "Put on ice" , "Put into long-term storage" , "Postpone work" , "Small sphere to keep insects from eating clothes" .)