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Director's dreadful pie chart offering minimal layout (4,5)

Ross

I believe the answer is:

dirt cheap

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'director's dreadful pie chart offering minimal layout' is the definition.
I can't tell whether this defines the answer.

'director's dreadful pie chart' is the wordplay.
'director' becomes 'd' (abbreviation eg in film reviews).
'dreadful' is an anagram indicator.
'pie'+'chart'='piechart'
'piechart' is an anagram of 'irtcheap'.
'd'+'irtcheap'='DIRT-CHEAP'

Can you help me to learn more?

(Other definitions for dirt cheap that I've seen before include "next to nothing" , "attractive to potential buyer?" , "Greatly reduced in price" , "Inexpensive (as muck?)" , "doing little damage?" .)

I've seen this clue in The Independent.
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