A couple of things holding up Starmer maybe announcing notable achievement? (4)
I believe the answer is:
feet
'a couple of things holding up starmer' is the definition.
I can't tell whether this defines the answer.
'announcing notable achievement?' is the wordplay.
'announcing' indicates a 'sounds like' (homophone) clue.
'notable achievement?' becomes 'feat' (I've seen this before).
'feat' is a homophone of 'FEET'.
'maybe' acts as a link.
Can you help me to learn more?
(Other definitions for feet that I've seen before include "Metrical units" , "On which we stand" , "Paws" , "Linear Units of a third of a yard" , "Base supports" .)