Merseyside's first safari park starting to change focus rapidly (4)
I believe the answer is:
zoom
'starting to change focus rapidly' is the definition.
I can't judge whether this definition defines the answer.
'merseyside's first safari park' is the wordplay.
'merseyside' becomes 'm' (this might be a standard abbreviation I've not previously seen).
'first' is a charade indicator (letters next to each other).
'safari park' becomes 'zoo' (I've seen this in another clue).
'm' put after 'zoo' is 'ZOOM'.
Can you help me to learn more?
(Other definitions for zoom that I've seen before include "Move swiftly and noisily" , "George --, gave his name to a form of algebra" , "Move or rise rapidly - type of lens" , "Rush around" , "Change focus smoothly" .)