Understanding most about having registered trouble ahead (9,5)

'trouble ahead' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'understanding most about having registered' is the wordplay.
I cannot really see how this works, but
'understanding' could be 'gathering' ('gather' can be a synonym of 'understand') and 'gathering' is located in the answer.
'registered' could be 'r' (abbreviation, as in registered trademark) and 'r' is found within the answer.
an anagram of 'most' is 'stom' which is present in the left over letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?