She will show a dress pattern (5)
I believe the answer is:
model
'pattern' is the definition.
(I know that pattern can be written as model)
'she will show a dress' is the wordplay.
I cannot quite see how this works, but
'she' could be 'del' and 'del' is located in the answer.
The remaining letters 'mo' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for model that I've seen before include "Poser for painter or photographer" , "Possibly the last" , "Small-size version" , "clothes horse?" , "Exemplar of chic" .)