Drop in velocity — could that be right? (5)
I believe the answer is:
visit
'drop in' is the definition.
(I've seen this in another clue)
'velocity could that be right?' is the wordplay.
I cannot really see how this works, but
'velocity' could be 'v' (scientific abbreviation) and 'v' is located in the answer.
'be' could be 'sit' (sitting is a kind of being) and 'sit' is located in the answer.
A single letter 'i' remains 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 visit that I've seen before include "Look up" , "Pay social call" , "Call in to see, socially or on business" , "Drop in; frequent" , "pop by" .)