Issue consuming Brown small, or hard to handle? (10)

'hard to handle?' is the definition.
I can't judge whether this defines the answer.

'issue consuming brown small' is the wordplay.
I cannot really understand how this works, but
'brown' could be 'umber' (umber is a kind of brown) and 'umber' is present in the answer.
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is located in the answer.
The remaining letters 'come' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'or' is the link.

Can you help me to learn more?