Unwanted pics of hot-tub men (4)
I believe the answer is:
spam
'unwanted pics' is the definition.
I can't tell whether this definition defines the answer.
'hot-tub men' is the wordplay.
'hot tub' becomes 'spa' (I've seen this in another clue).
'men' becomes 'm' (I can't explain this - if you can you should give a lot more credence to this answer).
'spa'+'m'='SPAM'
'of' is the link.
Can you help me to learn more?
(Other definitions for spam that I've seen before include "Spiced ham" , "Junk emails" , "Junk email" , "Tinned meat - unwanted email" , "unwanted correspondence" .)