Firmly covered up romance, cuddling Romeo -- Papa dealt roughly (6-6)
I believe the answer is:
armour-plated
'firmly covered up' is the definition.
I can't tell whether this defines the answer.
'romance cuddling romeo papa dealt roughly' is the wordplay.
'romance' becomes 'amour' (I've seen this in another clue).
'cuddling' indicates putting letters inside (inserted letters are cuddled or held).
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'papa' becomes 'P' (phonetic alphabet: alpha, bravo, charlie etc.).
'roughly' is an anagram indicator.
'amour' going around 'r' is 'armour'.
'dealt' anagrammed gives 'lated'.
'armour'+'p'+'lated'='ARMOUR-PLATED'
Can you help me to learn more?
(Other definitions for armour-plated that I've seen before include "Bulletproof" , "Having a hard defensive skin" , "Well-protected" .)