What does the cryptic crossword clue "Nonsense piece of photoshopping (4)" mean?

The definition is "Nonsense". The wordplay uses a hidden word. A hidden answer (‘piece of’) in ‘pho TOSH opping’. The answer is TOSH.

Nonsense piece of photoshopping (4)

Guardian Cryptic #29267 | 26 Across | 2024-01-01 flower