When tipping, almost mislaid Peruvian coin (3)
I believe the answer is:
sol
'peruvian coin' is the definition.
(I've seen this in another clue)
'when tipping almost mislaid' is the wordplay.
'when tipping' says the letters should be written in reverse.
'almost' means to remove the last letter (most of the word but not all of it).
'mislaid' becomes 'lost' (similar in meaning).
'lost' with its last letter taken off is 'los'.
'los' backwards is 'SOL'.
(Other definitions for sol that I've seen before include "The Sun (or Campbell?)" , "Note - colloid - the Sun" , "The sun in Spain" , "Roman sun-god" , "Personification of the sun" .)