Understanding rate is getting faster (9,5)

'getting faster' is the definition.
I can't tell whether this defines the answer.

'understanding rate' is the wordplay.
I cannot quite understand how this works, but
'understanding' could be 'gathering' ('gather' can be a synonym of 'understand') and 'gathering' is present in the answer.
'rate' could be 'speed' (speed is a kind of rate) and 'speed' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'is' is the link.

Can you help me to learn more?