Dad will get the pastries and flowers (7)
I believe the answer is:
poppies
'flowers' is the definition.
(poppy is a kind of flower)
'dad will get the pastries' is the wordplay.
'dad' becomes 'pop' (synonyms).
'will get' says to put letters next to each other.
'the pastries' becomes 'pies' (pie is a kind of pastry).
'pop'+'pies'='POPPIES'
'and' is the link.
(Other definitions for poppies that I've seen before include "Sources of opium" , "Opium-yielding flower plants" , "Scarlet flowers" , "Large bright flowers" .)