High point reached, some problem catching up (4)
I believe the answer is:
acme
'high point reached' is the definition.
(acme can mean a summit)
'some problem catching up' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'emca' can be found hidden inside 'problem catching'.
'emca' written backwards gives 'ACME'.
(Other definitions for acme that I've seen before include "Summit - climax" , "'Highest point, apex (4)'" , "Highest point of excellence or achievement" , "Came awkwardly to the highest point" , "Summit - zenith" .)