Bloomer shown by the Italian in large yard (4)
I believe the answer is:
lily
'bloomer' is the definition.
(I've seen this before)
'the italian in large yard' is the wordplay.
'the italian' becomes 'il' ('the' in Italian).
'in' means one lot of letters goes inside another.
'large' becomes 'L' (eg in clothes sizes).
'yard' becomes 'y' (abbreviation).
'l'+'y'='ly'
'il' inserted inside 'ly' is 'LILY'.
'shown by' is the link.
(Other definitions for lily that I've seen before include "Fleur-de-lis" , "Eg, arum, calla" , "Bulbous flowering plant" , "Type of flower" , "Fragrant flower" .)