Change into top gear? (5,2)
I believe the answer is:
dress up
'top gear?' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'change into' is the wordplay.
'change' becomes 'dress' (dressing is a kind of changing).
'into' becomes 'up' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'dress'+'up'='DRESS UP'
Can you help me to learn more?
(Other definitions for dress up that I've seen before include "Wear one's best" , "Put on best clothes - put on fancy dress - improve appearance of" , "Make (something) more interesting" , "Masquerade" , "Doctor" .)