Labour henchman holds back prime minister (5)
I believe the answer is:
nehru
'minister' is the definition.
(I know that Nehru was a prime minister)
'labour henchman holds back' is the wordplay.
'holds' indicates the answer is hidden within the clue.
'back' says the letters should be written in reverse.
'urhen' can be found hidden inside 'labour henchman'.
'urhen' reversed gives 'NEHRU'.
'prime' acts as a link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for nehru that I've seen before include "was India's leader" , "First prime minister of 5" , "Student of Gandhi" , "Popular Indian" , "Famous Indian" .)