Misjudge foolish nude nap with current boyfriend? (13)
I believe the answer is:
underestimate
'misjudge' is the definition.
(I know that underestimate is a more specific form of misjudge)
'foolish nude nap with current boyfriend?' is the wordplay.
'foolish' indicates anagramming the letters (a foolish spelling).
'nap' becomes 'rest' (I've seen this in another clue).
'with current boyfriend?' becomes 'imate' (I can't explain this - if you can you should believe this answer much more).
'nude' is an anagram of 'unde'.
'unde'+'rest'+'imate'='UNDERESTIMATE'
Can you help me to learn more?
(Other definitions for underestimate that I've seen before include "Sell short" , "Low guess" , "inaccurate" , "Rate as too low" , "Regard (someone) as less capable than is the case" .)