A press arrangement is decidedly scanty (6)
I believe the answer is:
sparse
'decidedly scanty' is the definition.
'sparse' can be an answer for 'scanty' (I've seen this in another clue). I am unsure of the 'decidedly' bit.
'a press arrangement' is the wordplay.
'arrangement' indicates anagramming the letters.
'a'+'press'='apress'
'apress' is an anagram of 'SPARSE'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for sparse that I've seen before include "Meagre, scanty" , "Thinly spread" , "Thinly dotted about" , "rarely occurring" , "Meagre; scarce" .)