The most common and most likely answer to this crossword clue is the 6 letter word GRAFTS
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The straight part
We know that "works intensively" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case works intensively = grafts.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does GRAFTS mean?
GRAFTS noun- A small shoot or scion of a tree inserted in another tree, the stock of which is to support and nourish it. The two unite and become one tree, but the graft determines the kind of fruit.
- A branch or portion of a tree growing from such a shoot.
- A portion of living tissue used in the operation of autoplasty.
- To insert (a graft) in a branch or stem of another tree; to propagate by insertion in another stock; also, to insert a graft upon.
- To insert scions (grafts) from one tree, or kind of tree, etc., into another; to practice grafting.
- To implant a portion of (living flesh or akin) in a lesion so as to form an organic union.
- To join (one thing) to another as if by grafting, so as to bring about a close union.
- To cover, as a ring bolt, block strap, splicing, etc., with a weaving of small cord or rope-yarns.
- To form a graft polymer
- A ditch, a canal.
- The depth of the blade of a digging tool such as a spade or shovel.
- A narrow spade used in digging drainage trenches.
- Corruption in official life.
- Illicit profit by corrupt means, especially in public life.
- A criminal’s special branch of practice.
- A con job.
- A cut of the take (money).
- A bribe, especially on an ongoing basis.
- Work; labor
- A job or trade.
- Effort needed for doing hard work.
- To work.
- To obtain illegal gain from bribery or similar corrupt practices.