Hiding nothing, Claud's upset about the National Front (6)
I believe the answer is:
unclad
'hiding nothing claud's upset about the national front' is the definition.
I can't judge whether this definition defines the answer.
'claud's upset about the national front' is the wordplay.
'upset' is an anagram indicator.
'about' means one lot of letters goes inside another.
'front' indicates taking the first letters.
The first letter of 'national' is 'n'.
'claud' with letters rearranged gives 'uclad'.
'uclad' enclosing 'n' is 'UNCLAD'.
Can you help me to learn more?
(Other definitions for unclad that I've seen before include "Uncovered" , "Not wearing clothes" , "Not dressed" , "without clothing" , "Undressed" .)