Hem in heartbeats, deployed in one go (2,3,4,6)
I believe the answer is:
in the same breath
'hem in heartbeats deployed in one go' is the definition.
I can't tell whether this defines the answer.
'hem in heartbeats deployed' is the wordplay.
'deployed' indicates an anagram.
'hem'+'in'+'heartbeats'='heminheartbeats'
'heminheartbeats' with letters rearranged gives 'IN THE SAME BREATH'.
Can you help me to learn more?
(Other definitions for in the same breath that I've seen before include "with a single blow?" , "Without breaking off" , "needing no further inspiration?" , "Together" .)