Something elasticated in mind (5)
I believe the answer is:
brain
'mind' is the definition.
(I know that mind can be written as brain)
'something elasticated in' is the wordplay.
I cannot quite see how this works, but
'in' is within the answer.
The remaining letters 'bra' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for brain that I've seen before include "Thinking thing" , "Organ of the intellect" , "Clever type" , "Whack on the head" , "Mastermind" .)