Pound discovered in bathrobe (5)
I believe the answer is:
throb
'pound' is the definition.
(I know that pulsate is a type of beat)
'discovered in bathrobe' is the wordplay.
'discovered' says the answer is hidden in the clue (remove the letters covering the answer in the clue).
'THROB' is hidden within 'in bathrobe'.
(Other definitions for throb that I've seen before include "Drum" , "beat repeatedly" , "Strong regular beat" , "Pulsate strongly" , "Beat like heart" .)