Fretful ones touch food items finally (12)

'fretful ones' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'touch food items finally' is the wordplay.
I cannot really see how this works, but
'touch' could be 'finger' (fingering is a kind of touching) and 'finger' is located in the answer.
'food' could be 'board' (board is a kind of food) and 'board' is found in the answer.
A single letter 's' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?