Being low, in a sense, you need a piece of pineapple (4)
I believe the answer is:
neap
'being low' is the definition.
(thesaurus)
'a sense you need a piece of pineapple' is the wordplay.
'NEAP' is hidden within the letters.
But, I am not sure how the hidden word is indicated.
'in' is the link.
Can you help me to learn more?
(Other definitions for neap that I've seen before include "Tide with the smallest vertical range" , "Tide when there is the least variation between high and low water" , "Of smallest tidal range" , "Sort of tide" , "Tide when there is least difference between high and low water" .)