Cakes made by females in part of UK (7)
I believe the answer is:
Here is my best explanation:
'cakes' is the definition.
(waffle is a kind of cake)
'females in part of uk' is the subsidiary indication.
'females' becomes 'ff' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'part of uk' becomes 'wales' ('Wales' is part of 'uk').
'ff' going inside 'wales' is 'waffles'.
'made by' is the link.
(Other definitions for waffles that I've seen before include "Talks vaguely", "doesn't avoid 27 [VERBIAGE]", "Cakes" and "Talks imprecisely".)