Northern stretch of land will produce mother-of-pearl (5)
I believe the answer is:
nacre
'mother-of-pearl' is the definition.
(I know that mother-of-pearl can be written as nacre)
'northern stretch of land' is the wordplay.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'stretch of land' becomes 'acre' (I've seen this before).
'n'+'acre'='NACRE'
'will produce' is the link.
(Other definitions for nacre that I've seen before include "Mother of pearl" , "valuable material" , "Mother-of-pearl - crane (anag)" , "Constituent of inlay furniture" , "Mother-of-pearl from shellfish" .)