What does the cryptic crossword clue "Barely able to put together complex set (4,3)" mean?

The wordplay uses a charade (building blocks). HARD (synonym="‘complex’") + PUT (synonym="‘set’, verb") = HARDPUT The answer is HARDPUT.

Barely able to put together complex set (4,3)

Guardian Cryptic #29394 | 5 Down | 2024-05-28 flower