Feature the centre of a pearl (3)
I believe the answer is:
ear
'feature' is the definition.
(I've seen this in other clues)
'the centre of a pearl' is the wordplay.
'the centre of' indicates the central letters.
The central letters of 'pearl' are 'EAR'.
(Other definitions for ear that I've seen before include "Fruiting head of corn" , "Lug (colloq.)" , "Ability to recognise sounds" , "Speculator ignoring British" , "Seed-bearing part of corn" .)