How might one stick things up? Crikey! (2,3)
I believe the answer is:
by gum
'crikey' is the definition.
(both express surprise)
'how might one stick things up?' is the wordplay.
I cannot quite understand how this works, but
'stick' could be 'gum' (I've seen this before) and 'gum' is found within the answer.
The remaining letters 'by' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for by gum that I've seen before include "It's emphatically uttered" , "Brother in N England" , "Mild oath (how things can be fixed!)" .)